2 * Gary Jennejohn (C) 2003 <gj@denx.de>
3 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
6 * This program is free software; you can distribute it and/or modify it
7 * under the terms of the GNU General Public License (Version 2) as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
19 * Routines for generic manipulation of the interrupts found on the
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/module.h>
30 #include <asm/amazon/amazon.h>
31 #include <asm/amazon/irq.h>
32 #include <asm/bootinfo.h>
33 #include <asm/irq_cpu.h>
37 static void amazon_disable_irq(unsigned int irq_nr)
40 u32 amazon_ier = AMAZON_ICU_IM0_IER;
42 if (irq_nr <= INT_NUM_IM0_IRL11 && irq_nr >= INT_NUM_IM0_IRL0)
43 amazon_writel(amazon_readl(amazon_ier) & (~(AMAZON_DMA_H_MASK)), amazon_ier);
45 irq_nr -= INT_NUM_IRQ0;
46 for (i = 0; i <= 4; i++)
49 amazon_writel(amazon_readl(amazon_ier) & ~(1 << irq_nr ), amazon_ier);
56 static void amazon_mask_and_ack_irq(unsigned int irq_nr)
59 u32 amazon_ier = AMAZON_ICU_IM0_IER;
60 u32 amazon_isr = AMAZON_ICU_IM0_ISR;
62 if (irq_nr <= INT_NUM_IM0_IRL11 && irq_nr >= INT_NUM_IM0_IRL0){
63 amazon_writel(amazon_readl(amazon_ier) & (~(AMAZON_DMA_H_MASK)), amazon_ier);
64 amazon_writel(AMAZON_DMA_H_MASK, amazon_isr);
66 irq_nr -= INT_NUM_IRQ0;
67 for (i = 0; i <= 4; i++)
70 amazon_writel(amazon_readl(amazon_ier) & ~(1 << irq_nr ), amazon_ier);
71 amazon_writel((1 << irq_nr ), amazon_isr);
80 static void amazon_enable_irq(unsigned int irq_nr)
83 u32 amazon_ier = AMAZON_ICU_IM0_IER;
85 if (irq_nr <= INT_NUM_IM0_IRL11 && irq_nr >= INT_NUM_IM0_IRL0)
86 amazon_writel(amazon_readl(amazon_ier) | AMAZON_DMA_H_MASK, amazon_ier);
88 irq_nr -= INT_NUM_IRQ0;
89 for (i = 0; i <= 4; i++)
92 amazon_writel(amazon_readl(amazon_ier) | (1 << irq_nr ), amazon_ier);
99 static unsigned int amazon_startup_irq(unsigned int irq)
101 amazon_enable_irq(irq);
105 static void amazon_end_irq(unsigned int irq)
107 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) {
108 amazon_enable_irq(irq);
112 static struct hw_interrupt_type amazon_irq_type = {
114 .startup = amazon_startup_irq,
115 .enable = amazon_enable_irq,
116 .disable = amazon_disable_irq,
117 .unmask = amazon_enable_irq,
118 .ack = amazon_mask_and_ack_irq,
119 .mask = amazon_disable_irq,
120 .mask_ack = amazon_mask_and_ack_irq,
121 .end = amazon_end_irq
124 /* Cascaded interrupts from IM0-4 */
125 static inline void amazon_hw_irqdispatch(u8 line)
129 irq = (amazon_readl(AMAZON_ICU_IM_VEC) >> (line * 5)) & AMAZON_ICU_IM0_VEC_MASK;
130 if (line == 0 && irq <= 11 && irq >= 0) {
131 //DMA fixed to IM0_IRL0
134 do_IRQ(irq + INT_NUM_IRQ0 + (line * 32));
137 asmlinkage void plat_irq_dispatch(void)
139 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
140 if (pending & CAUSEF_IP7){
141 do_IRQ(MIPS_CPU_TIMER_IRQ);
145 for (i = 0; i <= 4; i++)
147 if(pending & (CAUSEF_IP2 << i)){
148 amazon_hw_irqdispatch(i);
153 printk("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status());
158 static struct irqaction cascade = {
159 .handler = no_action,
160 .flags = SA_INTERRUPT,
164 void __init arch_init_irq(void)
168 /* mask all interrupt sources */
169 for(i = 0; i <= 4; i++){
170 amazon_writel(0, AMAZON_ICU_IM0_IER + (i * 0x10));
175 /* set up irq cascade */
176 for (i = 2; i <= 6; i++) {
177 setup_irq(i, &cascade);
180 for (i = INT_NUM_IRQ0; i <= INT_NUM_IM4_IRL31; i++) {
181 irq_desc[i].status = IRQ_DISABLED;
182 irq_desc[i].action = 0;
183 irq_desc[i].depth = 1;
184 set_irq_chip(i, &amazon_irq_type);